[R] Conversion of strings to expressions

[John Fox]

Dear Alexander,

You can use get("vec").

I hope this helps,
 John

On Thu, 4 Nov 2004 15:00:21 +0100
 Alexander Sokol <alexandersokol at ofir.dk> wrote:
> Hello,
> 
> I'm not sure how to state my question in a technically accurate
> manner, so 
> I'll use a short example to clarify my problem:
> 
> Say I have a vector,
> 
> vec<-c(1,2,3,2)
> 
> I would like to be able to "reference" the vector by using the string
> 
> containing the name of the vector - that is, I would like to know of
> some 
> function which is able to convert the string "vec" into the vector
> vec itself. 
> The purpose of this is to be able to do something like
> 
> >somefunc("vec")==2
> [1] FALSE TRUE FALSE TRUE
> 
> I hope it is clear from this what the problem is. It seems to me that
> the 
> function desired is akin to a sort of "inverse" to the quote()
> function, but I 
> have been unable to find such a function.
> 
> I am using R 1.9.1 on Windows 2000 SP4. Does anyone have a suggestion
> of how 
> to solve the problem?
> 
> Thanks,
>  Alexander
> 
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--------------------------------
John Fox
Department of Sociology
McMaster University
Hamilton, Ontario, Canada
http://socserv.mcmaster.ca/jfox/